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Rock type, terrain, and water table fluctuations. Duricrusts occur on a wide range
of igneous, metamorphic, and sedimentary rocks, including granites, basalts and
gabbros, aren- ites, and argillites. There is only the roughest of tendencies for ...
... Chicago; photograph, John H Gerard — EB Inc. most commonly as a glassy,
many-hued vein mineral and is often associated with lead and silver ores; it also
occurs in cavities, in sedimentary rocks, in pegmatites, and in hot- springs areas.
The push exerted by an advancing glacier also may throw weakly consolidated
rocks into folds, and the compaction of sedimentary rocks over buried hills gives
rise to gentle folds. In nature, folds are rarely produced by a single process but by
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The New Encyclopaedia Britannica (Encyclopaedia)User Review - Not Available - Book Verdict
For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review